Detection and Parameter Estimation for LFM Signal Based on Fractional Fourier Transform
Jiang Yan · Journal of Military Communications Technology · 2012
Due to the motion of a target,rader return signal is usually Linear Frequency modulated(LFM) signal with unknown frequency and unknown frequency modulated rate.The detection and estimation of the unknown parameter is the main task in radar signal processing.So this paper took advantage of the energy concentration property of LFM signal in the fractional Fourier transform domain,and introduced three algorithms of detection and estimation of LFM signal:2D peak searching algorithm,two steps searching of maximum value algorithm and pre-estimation algorithm.The detection and parameter estimation in the background of AWGN were simulated for these three algorithms.The simulation results indicate that the two steps searching algorithm of maximum value based on FRFT take on nice estimation accuracy and low computation complexity at low SNR,providing possibility for engineering application.